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Preferred Shares - Series Cumulative Redeemable Rate Reset Preferred Shares Conversion (Details) - $ / shares |  |  |  |  |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 01, 2021 | Dec. 23, 2020 | Nov. 03, 2020 | Sep. 17, 2017 | Jun. 16, 2017 | Dec. 31, 2020 | Dec. 31, 2019 | Aug. 30, 2019 | Mar. 17, 2016
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |
Remaining balance threshold for conversion to other series (in shares) | 1,000,000 |  |  |  |  |  |  |  |
Dividends declared per share |  | $ 0.0450 | $ 0.0425 |  |  |  |  |  |
Series G |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |
Convertible Preferred Shares , Threshold For Required Shares Conversion |  |  |  | 1,000,000,000,000 |  |  |  |  |
Convertible preferred shares tendered for conversion |  |  |  |  |  |  |  | 140,730 |
Annualized fixed dividend rate |  |  |  |  |  | 4.988% |  |  |
Bond yield |  |  |  |  |  | 1.188% |  |  |
Dividend rate on preference shares, spread |  |  |  |  |  | 3.80% |  |  |
Number of shares outstanding |  |  |  |  |  | 6,600,000 | 6,600,000 |  |
Dividends declared per share |  | 0.31175 |  |  |  |  |  |  |
Series E |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |
Convertible Preferred Shares , Threshold For Required Shares Conversion |  |  |  | 1,000,000,000,000 |  |  |  |  |
Convertible preferred shares tendered for conversion |  |  |  | 133,969 |  |  |  |  |
Annualized fixed dividend rate |  |  |  |  |  | 5.194% |  |  |
Bond yield |  |  |  |  |  | 1.544% |  |  |
Bond yield, period |  |  |  |  |  | 5 years |  |  |
Dividend rate on preference shares, spread |  |  |  |  |  | 3.65% |  |  |
Number of shares outstanding |  |  |  |  |  | 9,000,000.0 | 9,000,000.0 |  |
Dividends declared per share |  | 0.32463 |  |  |  |  |  |  |
Series C |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |
Convertible Preferred Shares , Threshold For Required Shares Conversion |  |  |  |  | 1,000,000,000,000 |  |  |  |
Convertible preferred shares tendered for conversion |  |  |  |  | 827,628 |  |  |  |
Annualized fixed dividend rate |  |  |  |  |  | 4.027% |  |  |
Bond yield |  |  |  |  |  | 0.927% |  |  |
Bond yield, period |  |  |  |  |  | 5 years |  |  |
Dividend rate on preference shares, spread |  |  |  |  |  | 3.10% |  |  |
Number of shares outstanding |  |  |  |  |  | 11,000,000.0 | 11,000,000.0 |  |
Dividends declared per share |  | 0.25169 |  |  |  |  |  |  |
Series A |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |
Annualized fixed dividend rate |  |  |  |  |  | 2.709% |  |  |
Bond yield | 0.847% |  |  |  |  |  |  |  |
Bond yield, period | 5 years |  |  |  |  |  |  |  |
Dividend rate on preference shares, spread | 2.03% |  |  |  |  |  |  |  |
Number of shares converted into other classes of shares |  |  |  |  |  |  |  |  | 1,824,620
Number of shares outstanding |  |  |  |  |  | 10,200,000 | 10,200,000 |  | 12,000,000.0
Payment period for cumulative preferential cash dividends |  |  |  |  |  | 5 years |  |  |
Dividends declared per share |  | 0.16931 |  |  |  |  |  |  |
Series A | Later than four years and not later than five years |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |
Annualized fixed dividend rate | 2.877% |  |  |  |  |  |  |  |
Series B |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |
Annualized fixed dividend rate |  |  |  |  |  | 2.03% |  |  |
Bond yield | 0.073% |  |  |  |  |  |  |  |
Dividend rate on preference shares, spread | 2.03% |  |  |  |  | 2.03% |  |  |
Number of shares outstanding |  |  |  |  |  | 1,800,000 | 1,800,000 |  |
Payment period for cumulative preferential cash dividends |  |  |  |  |  | 5 years |  |  |
Dividends declared per share |  | $ 0.13186 |  |  |  |  |  |  |
Series B | Later than four years and not later than five years |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |
Annualized fixed dividend rate | 2.103% |  |  |  |  |  |  |  |

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